Devices, Send/Sync

[pmathia0]

Hello,
could someone please explain difference between ash::Device and ash::vk::Device?

Also, why do they implement Send and Sync traits? The spec says the access to VkDevice must be externally synchronized. Am I missing something?

Thank you

[nickkuk]

ash::vk::Device is just 64-bit Vulkan handle; ash::Device is ash::vk::Device plus addresses of loaded functions.

In Vulkan spec chapter Threading Behavior you can see that in Vulkan only parameters of some functions must be externally synchronized. For VkDevice it is only vkDestroyDevice and while using ash you must do this synchronization yourself, e.g. just create impl Drop for your device wrapper (which also can implement Send and Sync).

[pmathia0]

I see. Thank you for explanation!